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1
Preheat the oven to 350 degrees F (175 degrees C). Lightly grease a 9x13-inch baking pan.
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2
Heat vegetable oil in a medium saucepan over medium-high heat. Saute zucchini and onion until softened, about 8 minutes. Add garlic; cook for 2 minutes. Remove from heat and let mixture cool to room temperature.
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3
Soak bread in a small bowl with milk until milk is absorbed, about 2 minutes. Remove bread and gently squeeze out excess milk. Place bread in a food processor and pulse until mixture forms fine crumbs resembling wet sand.
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4
Combine ground turkey with the sauteed zucchini mixture, bread crumbs, oregano, salt, pepper, and nutmeg in a large bowl. Add eggs, Parmesan cheese, and parsley; mix thoroughly. Form mixture into 12 large meatballs using a large ice cream scoop.
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5
Place 1/3 cup flour in a shallow dish. Dredge meatballs in flour and place 1 inch apart in the prepared baking pan. Drizzle olive oil over meatballs.
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6
Bake in the preheated oven until meatballs are lightly browned on top and no longer pink in the center, 30 to 38 minutes. An instant-read thermometer inserted into the center of a meatball should read at least 160 degrees F (71 degrees C).
